4-2A

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(100);

}

//generative art gif

​

var r = 0

var x = 50, y= 50

var vx = 3, vy = 3

var txt = "Hello"

function draw() {

  // background(0)

  // print(5==110)

  if (mouseIsPressed){

    fill('red')

  }else{

    fill('yellow')

  }

  ellipse(x, y, 50);

  text(txt,x+100,y)

  txt = txt+"."

  x = x+vx

  y = y+vy

  vy += 0.2

  //反彈

  if (y>height){

    vy = -vy*0.5

    y=height

  }

}